tokevenGPTvsGemini
GPT 5.6 Luna vs Gemini Robotics ER 2
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.6 Luna
Fast / BudgetGemini Robotics ER 2
Fast / BudgetInput $/MTok
$0.20
$1.00
Output $/MTok
$1.20
$5.00
Cache discount
90% off
90% off
Context
922K
131.072K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
70
vs
0
Code Review
68
vs
0
Summarization
84
vs
0
Q&A
85
vs
0
Extraction
89
vs
0
Reasoning
63
vs
0
Classification
91
vs
0
Creative Writing
58
vs
0
GPT 5.6 Luna
Gemini Robotics ER 2
Guidance
When to use GPT 5.6 Luna vs Gemini Robotics ER 2
Choose GPT 5.6 Luna when...
- -Cost matters: 80% cheaper on input tokens
- -You need a larger context window (922K vs 131.072K)
Choose Gemini Robotics ER 2 when...
- Similar performance; consider provider preference or ecosystem fit.
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5.6 Luna
Gemini Robotics ER 2
100K tokens
$0.05Cheaper
$0.22
1M tokens
$0.82Cheaper
$2.20
10M tokens
$8.20Cheaper
$22.00
FAQ
When should I use GPT 5.6 Luna instead of Gemini Robotics ER 2?
GPT 5.6 Luna and Gemini Robotics ER 2 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Gemini Robotics ER 2 cheaper than GPT 5.6 Luna?
Gemini Robotics ER 2 input costs $1.00/MTok, which is 400% more than GPT 5.6 Luna at $0.20/MTok.
What are the context window sizes for GPT 5.6 Luna and Gemini Robotics ER 2?
GPT 5.6 Luna has a 922K token context window. Gemini Robotics ER 2 has a 131.072K token context window.
Go deeper on either model
Per-call cost calculators, provider lineups, and price history for both models on this page.
Other comparisons
How GPT 5.6 Luna and Gemini Robotics ER 2 stack up against the rest of the field.
Track your real costs
Comparisons show estimated costs at list price. The dashboard reveals your real spend and savings.